I watched a few innings of the play-off game in which the Texas Rangers disgraced themselves vis-a-vis the Orioles and heard a phrase used many times that I had not heard before. It certainly wasn't in use during baseball's heyday -- the era of Sandy Koufax and Rocky Colavito.

The phrase is "walk-off," as in "walk-off single" or "walk-off home run." What the heck does it mean? Is there such a thing as a "walk-off walk"?